protoplasm

noun

pro·​to·​plasm ˈprō-tə-ˌpla-zəm How to pronounce protoplasm (audio)
1
: the organized colloidal complex of organic and inorganic substances (such as proteins and water) that constitutes the living nucleus, cytoplasm, plastids, and mitochondria of the cell
2
protoplasmic adjective

Did you know?

After the word protoplasm was coined in the mid-19th century for the jellylike material that is the main substance of a cell, it began to be used widely, especially by scientists and others who imagined that the first life-forms must have arisen out of a great seething protoplasmic soup. Since protoplasm includes all the cell's living material, inside and outside the nucleus, it is a less useful scientific word today than more precise terms such as cytoplasm, which refers only to the living material outside the nucleus. But many remain fascinated by the image of that soup bubbling away as the lightning flashes and the volcanoes erupt.

Examples of protoplasm in a Sentence

Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
The bulbous clay forms, dotted with cell-like ovals, suggest protoplasm in a state of continual remaking. Mark Jenkins, Washington Post, 18 Aug. 2023 Munch believed that the cells and protoplasm in blood were connected to the earth. Sebastian Smee, Washington Post, 22 June 2023 Each tube has virtual protoplasm flowing through it, just as the branches of the slime mould do. Ed Yong, Discover Magazine, 22 Jan. 2010 On a computer screen that shows the display from the microscope, Trichoplax looks like a glowing, pulsing orb surrounded by cosmic protoplasm. Emily Underwood, The Atlantic, 8 June 2020 Altmann believed that cells themselves came into existence when these granules assembled into colonies and built a shelter of protoplasm around themselves. Carl Zimmer, STAT, 30 May 2018 Responding to a moldy sack of protoplasm who writes for the Daily Caller, CNN editor Chris Cillizza leapt to Jacobs’s defense. Brian Beutler, New Republic, 26 May 2017

Word History

Etymology

German Protoplasma, from prot- + New Latin plasma

First Known Use

1848, in the meaning defined at sense 1

Time Traveler
The first known use of protoplasm was in 1848

Dictionary Entries Near protoplasm

Cite this Entry

“Protoplasm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protoplasm. Accessed 8 Nov. 2024.

Kids Definition

protoplasm

noun
pro·​to·​plasm ˈprōt-ə-ˌplaz-əm How to pronounce protoplasm (audio)
: a mixture of various organic and inorganic substances (as proteins and water) that makes up the living nucleus, cytoplasm, plastids, and mitochondria of the cell and is considered the physical basis of life
protoplasmic adjective

Medical Definition

protoplasm

noun
pro·​to·​plasm ˈprōt-ə-ˌplaz-əm How to pronounce protoplasm (audio)
1
: the organized colloidal complex of organic and inorganic substances (as proteins and water) that constitutes the living nucleus, cytoplasm, plastids, and mitochondria of the cell and is regarded as the only form of matter in which the vital phenomena (as metabolism and reproduction) are manifested
2

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